文献类型：期刊文献

英文题名：Surface Hydroxyl Groups as Sacrificial Sites Enabling H2O Resistance in Sheet-Like Co-Based Catalysts for Low-Temperature CO Oxidation

作者：Liu, Yiqi[1];Chen, Zhiwei[1];Ma, Cheng[2];Wang, Jitong[1,3];Qiao, Wenming[1];Ling, Licheng[1]

机构：[1]East China Univ Sci & Technol, Sch Chem Engn, State Key Lab Green Chem Engn & Ind Catalysis, Shanghai 200237, Peoples R China;[2]East China Univ Sci & Technol, Sch Mat Sci & Engn, Key Lab Specially Funct Polymer Mat & Related Tech, Minist Educ, Shanghai 200237, Peoples R China;[3]Guangxi Univ, Sch Chem & Chem Engn, Guangxi Key Lab Petrochem Resource Proc & Proc Int, Nanning 530004, Peoples R China

年份：2025

卷号：10

期号：42

外文期刊名：CHEMISTRYSELECT

收录：;WOS:【SCI-EXPANDED(收录号:WOS:001610225800001)】；

基金：This work was partly supported by the National Natural Science Foundation of China (22178107, U21A2060, and 22178116).

语种：英文

外文关键词：Carbon monoxide; Cobalt; H2O resistance; Heterogeneous catalysis; Oxidation

摘要：The development of cobalt-based catalysts with enhanced H2O resistance is essential for efficient carbon monoxide (CO) oxidation under practical humid conditions. In this study, Co-based catalysts were synthesized via a hydrothermal method and subsequently controlled calcination to investigate the relationship between structural characteristics and catalytic performance. The sheet-like structure of the Co-HN with high surface area (101.5 m2g-1) and increased pore volume facilitates the exposure of active sites and improves gas diffusion. Co-HN demonstrated great catalytic activity, attributed to a higher proportion of Co3+ and oxygen vacancies, achieving 100% CO conversion at 140 degrees C under dry conditions and maintaining high activity even with 10 vol% water vapor, significantly outperforming catalysts calcined in air or prepared by precipitation. Mechanistic studies suggested that surface hydroxyl groups remaining from the precursor act as sacrificial sites, protecting active centers from water poisoning, while oxygen vacancies promote sustained CO oxidation through enhanced redox cycling. These findings provide insight into the development of efficient cobalt-based catalysts for CO oxidation.